CN104251814B - A kind of atmospheric corrosiveness appraisal procedure based on aluminium wire brass bolt galvanic corrosion - Google Patents
A kind of atmospheric corrosiveness appraisal procedure based on aluminium wire brass bolt galvanic corrosion Download PDFInfo
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- CN104251814B CN104251814B CN201310255050.XA CN201310255050A CN104251814B CN 104251814 B CN104251814 B CN 104251814B CN 201310255050 A CN201310255050 A CN 201310255050A CN 104251814 B CN104251814 B CN 104251814B
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Abstract
The invention provides a kind of atmospheric corrosiveness appraisal procedure based on aluminium wire brass bolt galvanic corrosion.Comprise the following steps: first aluminium wire is wound around on brass bolt screw thread, form assessment electricity consumption couple；Then assessment electricity consumption couple is exposed in the air of target area, analyzes and obtain aluminium wire corrosion weight loss percentage ratio；Atmospheric corrosiveness grade is divided further according to aluminium wire corrosion weight loss percentage ratio；The seasonal variation of divided rank is modified with average annual wetting time finally according to wetting time during exposing, it is thus achieved that final assessment result.The present invention utilizes galvanic corrosion to accelerate aluminium wire corrosion, and the exposure test time only needs 90 days.Meanwhile, according to wetting time during test and the impact on assessment result of the average annual wetting time correction seasonal variation, it is ensured that the accuracy of short time test assessment.The appraisal procedure of the present invention can meet the needs of short cycle engineering project atmospheric corrosiveness assessment, effectively accelerates demonstration and builds, and economic benefit is good.
Description
Technical field
The present invention relates to a kind of atmospheric corrosiveness appraisal procedure, specifically, relate to a kind of based on aluminium wire-copper bolt galvanic couple
The atmospheric corrosiveness appraisal procedure of corrosion.
Background technology
The atmospheric corrosiveness of different regions is because the difference of climate type and atmospheric pollution level also exists difference.Air is rotten
The assessment of erosion property can be metal product or the corrosion prediction of engineering structure in target area, material selects and corrosion protection design provides and depends on
According to, effective guarantee product quality and structural safety, simultaneously conservative control material and anticorrosion process cost.
Existing atmospheric corrosiveness appraisal procedure has standard metal method and environmental factors method.Standard metal method according to carbon steel,
The rate of corrosion of the metal testing plate exposure tests such as fine aluminium, pure zinc, fine copper determines atmospheric corrosiveness.Environmental factors method is according to long-term
Meteorology and the corrosive medium factor of monitoring determine atmospheric corrosiveness.For obtaining sufficient corrosive effect, consider environmental condition simultaneously
Seasonal variety, both approaches is all with 1 year as minimum period.And engineering project cycle request is shorter in a large number, therefore it is badly in need of
Exploitation can realize the method for atmospheric corrosiveness rapid evaluation.
Galvanic corrosion between dissimilar metal can accelerating anode corrosion of metal speed.For coupling the galvanic couple of metal material
Corrosion behavior, many research worker develop all kinds of simulation experiment method and means of testing, but these Method means are all for grinding
Study carefully the corrosive nature of material self.The most favourable galvanic corrosion realizes the method for atmospheric corrosiveness rapid evaluation, Qi Zhongyi
Individual major reason is the failure to the impact effectively getting rid of seasonal variation to short time result of the test.Wherein, seasonal variation is the brightest
Aobvious is exactly that being widely varied of temperature and humidity causes metal surface Various Seasonal wetting time fluctuation relatively big, particularly in north
Area, side and extremely frigid zones.
Summary of the invention
Present invention aim to address that existing atmospheric corrosiveness appraisal procedure is the most long and can not meet short cycle engineering item
The problem that mesh needs, it is provided that a kind of method utilizing galvanic corrosion to realize atmospheric corrosiveness rapid evaluation.
The present invention is achieved through the following technical solutions:
A kind of atmospheric corrosiveness appraisal procedure based on aluminium wire-copper bolt galvanic corrosion, comprises the steps:
(1) first aluminium wire is wound around on brass bolt screw thread, form assessment electricity consumption couple；
(2) then assessment electricity consumption couple is exposed 90 days in the air of target area, analyze and obtain aluminium wire corrosion weight loss hundred
Proportion by subtraction；
(3) atmospheric corrosiveness grade is divided further according to aluminium wire corrosion weight loss percentage ratio；
(4) finally according to wetting time, the seasonal variation of atmospheric corrosiveness grade classification is modified, it is thus achieved that final
Assessment result.
Described aluminium wire material is material 1100 fine aluminium, a length of 1m, a diameter of 3mm.
Described aluminium wire goes forward to remove oxide-film and weigh being wound in described brass bolt.
Described brass bolt material is T2 fine copper, diameter of bolt 25mm, and screw thread is 6mm regular screw threads.
Described brass bolt is provided with through hole and groove at screw thread head and the tail two ends, is used for fixing described aluminium wire.
Described brass bolt is designed with M10 × 1.5 standard thread at root, for coordinating fixing described assessment with insulated leg
Electricity consumption couple.
Described brass bolt needs to remove oxide-film before being wound around described aluminium wire.
Described assessment electricity consumption couple exposure chamber in the air of target area is outdoor exposure, position overhead 1.5m, side
Being axially perpendicular to ground to for bolt, open-assembly time is 90 days.
Described aluminium wire corrosion weight loss percentage ratio is that the aluminium wire after exposing is weighed after removing corrosion product, and its mass loss accounts for
The percentage ratio of initial mass.
Described atmospheric corrosiveness grade is divided into the lowest, low, medium, high, the highest, six grades of superelevation.
Described wetting time according to target area meteorological station temperature, humidity time Value Data carry out statistical computation, with temperature
Degree is higher than 0 DEG C, and relative humidity is wetting conditions higher than 80%.
The seasonal variation of described atmospheric corrosiveness grade classification is according to wetting time during average annual wetting time and exposure
Be relatively modified.
Invention effect
The present invention utilizes the potential difference between aluminium wire and brass bolt, accelerates aluminium wire by galvanic corrosion and corrodes, exposure is tried
Time of testing was foreshortened to 90 days by the most methodical at least one year, reached the purpose of rapid evaluation.Meanwhile, the temperature of meteorological station is utilized
Degree, humidity duration data statistics go out wetting time, poor with average annual wetting time correction seasonality according to wetting time during test
The different impact on assessment result, it is ensured that the accuracy of short time test assessment.
Accompanying drawing explanation
Fig. 1 is the machining sketch chart of brass bolt.
Fig. 2 is the machining sketch chart of the insulated leg of fixed copper bolt.
Fig. 3 is the aluminium wire coil schematic diagram of pretreatment.
Fig. 4 is assessment electricity consumption couple manufacturing process schematic diagram.
Fig. 5 exposes frame schematic diagram for assessment electricity consumption couple.
Detailed description of the invention
Below in conjunction with accompanying drawing, describe embodiments of the present invention in detail.
Fig. 1 is the brass bolt that present embodiment uses, and brass bolt screw thread is 6mm pitch regular screw threads.It is provided with at head end
The through hole of diameter 3.2mm, afterbody is provided with wide 3mm, and the groove of deep 5mm, for fixing the two ends of aluminium wire, from through hole to recessed
Reach at groove is 1m.It is M10 × 1.5 standard external in head end coupling part, is used for and the insulated leg shown in Fig. 2
Coordinate fixing.The brass bolt that present embodiment uses may utilize the T2 copper bar material processing of diameter 25mm.
Use degreaser fully to clean brass bolt, remove the surface and oil contaminant that processing causes, use the hydrochloric acid of 1.095mg/ml
Solution pickling 3 minutes, is dried after removing brass bolt surface oxide layer.
Fig. 2 is the insulated leg that present embodiment uses, and there is M10 × 1.5 standard female this insulated leg one end, is used for
Coordinate fixing with the brass bolt shown in Fig. 1.There is M10 × 1.5 standard external one end, comments whole for coordinating with standard nut
Estimate electricity consumption couple to be fixed in specimen holder.
The aluminium wire of diameter 3mm is cut into the segment of a length of 1.2m, this segment aluminium wire is wound in a diameter of 10cm left
On right rigid cylinder, then take off, form the aluminium wire coil shown in Fig. 3.
The phosphoric acid using 50g1.69g/ml adds distilled water with 20g chromic acid and is configured to 1000ml solution, by described aluminium wire
Coil is pickling 5 to 10 minutes in this solution be heated to 80 DEG C, after removing surface film oxide, are dried and weigh.
Seeing Fig. 4, the step that present embodiment makes assessment electricity consumption couple is as follows:
(1) aluminium wire coil head end is penetrated in through hole, along hand of spiral, aluminium wire is wound around wherein, it is to avoid form folding
Angle.
(2) when aluminium wire is wound to groove, aluminium wire end is snapped in wherein, cut off remainder, and remainder is claimed
Weight.
(3) brass bolt is tightened on insulated leg, forms assessment electricity consumption couple.
Fig. 5 is the schematic diagram assessing electricity consumption couple exposure test described in present embodiment.Exposure chamber is in target area
Outdoor exposure, position overhead 1.5m, direction is that bolt is axially perpendicular to ground, and open-assembly time is 90 days.For ensureing accuracy,
3 assessment electricity consumption couples of general employing make parallel test.
After exposing 90 days, described assessment galvanic couple being pulled down upper aluminium wire, pickling is weighed after removing corrosion product.According to exposure
Weighing data front and back, calculates its corrosion weight loss percentage ratio.
Present embodiment is according to the aluminium wire rate of corrosion of WO village test specimen, according to the table 1 atmospheric corrosiveness to test area
Grade carries out Preliminary division.Corrosion class is divided into the lowest, low, medium, high, the highest, six ranks of superelevation from low to high.
Table 1 atmospheric corrosiveness grading range
Present embodiment calculates wetting time according to Value Data when target area meteorological station temperature, humidity, high with temperature
In 0 DEG C, relative humidity is wetting conditions higher than 80%.Year, profit Time Calculation formula was shown in formula 1, and the wetting time during exposure can be adopted
Use same computational methods.
In formula: TWYear wetting time (h)；
TW(i, j) this moment wetting time, when this moment temperature is higher than 0 DEG C and RH > 80%,
TW(i, j)=1, otherwise TW(i,j)=0。
Assessment result is modified with average annual wetting time by present embodiment according to wetting time during test, correction side
Method is shown in Table 2.Revise that later evaluation result is the highest is less than 6 grades, minimum 1 grade.
Table 2 reassessment method
The present invention utilizes aluminium wire-copper bolt galvanic corrosion, by the atmospheric corrosiveness evaluation time by the most methodical at least one
Year foreshortens to 90 days.Simultaneously according to the impact on assessment result of the wetting time correction seasonal variation.Forests in Wanning, Hainan Islands (coastal),
The assessment application of the different regions such as Jiangjin, Chongqing (industrial occupancy), Heilungkiang Mo River, Lhasa, Dunhuang, Gansu Province shows, the present invention
In the case of the evaluation time significantly shortens, assessment result is consistent with existing standard metal method and environmental factors method.The present invention
Application can meet the needs of short cycle engineering project atmospheric corrosiveness assessment, effectively accelerate demonstration and build, economic benefit is good.
Preferred implementation is simply described by above-described detailed description of the invention, not enters the scope of the present invention
Row limits.On the premise of designing spirit without departing from the present invention, those of ordinary skill in the art are to technical scheme
Various deformation and improvement, all should fall in the protection domain that claims of the present invention determines.
Claims (7)
1. an atmospheric corrosiveness appraisal procedure based on aluminium wire-brass bolt galvanic corrosion, it is characterised in that include walking as follows
Rapid:
1) first aluminium wire is wound around on brass bolt screw thread, form assessment electricity consumption couple；
2) then assessment electricity consumption couple air will expose certain time, and analyze and obtain aluminium wire corrosion weight loss percentage ratio；
3) atmospheric corrosiveness grade is divided further according to aluminium wire corrosion weight loss percentage ratio；
4) finally according to wetting time, the seasonal variation of atmospheric corrosiveness grade classification is modified, it is thus achieved that finally assess knot
Really;Described wetting time according to target area meteorological station temperature, humidity time Value Data carry out statistical computation, with temperature
Higher than 0 DEG C, relative humidity is wetting conditions higher than 80%, the final root of seasonal variation of described atmospheric corrosiveness grade classification
According to average annual wetting time with expose during being relatively modified of wetting time.
2. the atmospheric corrosiveness appraisal procedure as described in claim 1, it is characterised in that: described assessment electricity consumption couple uses
A1100 aluminium wire, as anode, uses T2 brass bolt as negative electrode.
3. the atmospheric corrosiveness appraisal procedure as described in claim 2, it is characterised in that: a diameter of 3mm of described aluminium wire, copper
The diameter of bolt is 25mm, and screw thread is pitch 6mm regular screw threads.
4. the atmospheric corrosiveness appraisal procedure as described in claim 1～3 any one, it is characterised in that: it is being wound
Before assessment electricity consumption couple, aluminium wire and brass bolt are carried out pickling, remove oxide on surface.
5. atmospheric corrosiveness appraisal procedure as claimed in claim 1, it is characterised in that: described assessment electricity consumption couple is in target
In regional atmospheric, exposure chamber is outdoor exposure, position overhead 1.5m, and direction is that bolt is axially perpendicular to ground, open-assembly time
It it is 90 days.
6. atmospheric corrosiveness appraisal procedure as claimed in claim 1, it is characterised in that: described aluminium wire corrosion weight loss percentage ratio
Being that the aluminium wire after exposing is being removed after corrosion product, its mass loss accounts for the percentage ratio of initial mass.
7. atmospheric corrosiveness appraisal procedure as claimed in claim 1, it is characterised in that: with aluminium wire corrosion weight loss percentage ratio from low
To height, it is the lowest, low, medium, high, the highest, six grades of superelevation by atmospheric corrosiveness grade classification.
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| CN111141661A (en) * | 2019-10-29 | 2020-05-12 | 中国电器科学研究院股份有限公司 | Method for evaluating galvanic corrosion of mechanical connection structure of dissimilar metal plates in automobile |
| CN114264591B (en) * | 2021-12-23 | 2023-05-12 | 中国兵器工业第五九研究所 | Device and method for evaluating corrosion appearance of metal standard part |
| CN117250146B (en) * | 2023-11-20 | 2024-04-09 | 中汽数据(天津)有限公司 | Evaluation method for galvanic corrosion reversal of automobile metal plate |
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| GB2365977A (en) * | 2000-07-19 | 2002-02-27 | Acm Instr | Corrosion monitoring system for use in multiple phase solutions |
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| PL213916B1 (en) * | 2010-06-21 | 2013-05-31 | Politechnika Wroclawska | Method for testing corrosion resistance of galvanic couples and sample for testing corrosion resistance of galvanic couples |
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| GB2365977A (en) * | 2000-07-19 | 2002-02-27 | Acm Instr | Corrosion monitoring system for use in multiple phase solutions |
| CN101738365A (en) * | 2008-11-06 | 2010-06-16 | 北京有色金属研究总院 | Accelerated test method for simulating atmospheric corrosion of metal materials |
| CN101782499A (en) * | 2009-01-21 | 2010-07-21 | 中国科学院金属研究所 | Method for predicting atmospheric corrosion rate of metal material |
| CN101608996A (en) * | 2009-07-22 | 2009-12-23 | 中国兵器工业第五九研究所 | The assay method of inland non-industrial atmospheric corrosiveness |
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